Description

The LLC converter is a resonant converter that can achieve ZVS operation (primary side switch) and ZCS operation (secondary side switch) simultaneously. It achieves low noise and high efficiency by generating a sinusoidal current waveform with the switch network and resonant circuit.
This circuit consists of a full-bridge switch circuit on the primary side and a center-tap transformer on the secondary side using FETs instead of diodes. This type of configuration is commonly used for relatively high power (around several kW).

Overview

- Same semiconductor devices
- Series resonance between Cr and Lr
- Lr is sometimes implemented as the leakage inductance of the transformer
- Voltage control is done through frequency high complexity design
- Soft switching is defined by magnetizing inductance Lm, not function of the load.
- Efficiency around 98% suits Titanium!
- Frequency 100..200 kHz